2022年青海门源6.9级地震交通系统震害与启示

Earthquake damage and enlightenment from traffic system in 2022 Qinghai Menyuan M_(s)6.9 earthquake

2022年1月8日,我国青海省海北州门源县发生了M_(s)6.9地震,震源深度10 km,此后又发生多次余震。门源历史上多有地震发生,震级相近且基本发震于冷龙岭断裂带。此次地震最高烈度为Ⅸ度,在Ⅵ度区至Ⅸ度区内,门源交通系统呈现出不同的震害表现,Ⅸ度区断层破碎带附近的兰新客专的桥梁和隧道震害严重,部分公路设施遭遇震害。文中首先分析了震中附近2组地震动的特点,然后分别介绍此次地震中铁路、公路系统中几座典型桥梁和隧道的震害特点,硫磺沟大桥是我国高铁第一次真正意义上的桥梁震害,大梁隧道跨断层震害也是我国高铁隧道第一次出现的严重破坏。并从统计角度分析兰新高铁、铁路桥梁与隧道、高速公路、国道与省道干线、农村公路及公路桥梁在不同烈度区的震害状况与结构形式的关系,发现近断层、跨断层交通结构震害较严重。最后讨论此次地震对我国高原地区交通结构抗震的经验与启示。

On January 8,2022,an M_(s)6.9 earthquake occurred in Menyuan County,Haibei Prefecture,Qinghai Province,China.The focal depth was 10 km,and several aftershocks followed.In the history of Menyuan,there were many earthquakes with similar magnitudes occurring in the Lenglongling fault zone.The highest intensity of the earthquake wasⅨdegree.In the areaⅥto the areaⅨ,Menyuan traffic system presented different performance of earthquake damage,the bridges and tunnels of Lanzhou-Xinjiang Passenger Line near the fault breakage zone of the areaⅨsuffered serious damage,and part of the highway facilities suffered earthquake damage.This article firstly analyzes the features of the two groups of the ground motion near the epicenter,then respectively introduces the railway and highway system in the earthquake damage characteristics of several typical bridges and tunnels.The Liuhuanggou bridge is the first time that China's high-speed rail bridges have seismic damage in the true sense,and the seismic damage across the fault of the Daliang tunnel is first appeared in high-speed rail tunnel in China.From the statistical point of view,the relationship between earthquake damage and structural form of LanXin high-speed railway,railway bridge and tunnel,expressway,national highway and provincial highway trunk line,rural high-way and highway bridge in different intensity area is analyzed,and it is found that the earthquake damage of traffic structure near fault and across fault is more serious.Finally,the experience and enlightenment of this earthquake to the seismic resistance of traffic structures in plateau area of China are discussed.